Dynacord DSP 244 User Manual

5 (2)
OWNER’S MANUAL
DSP 244
24 BIT DIGITAL SOUND SYSTEM PROCESSOR
1-1
IMPORTANT SAFETY INSTRUCTIONS
The lightning flash with arrowhead symbol, within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintance (servicing) instructions in the literature accompanying the appliance.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a damp cloth.
7. Do not block any of the ventilation openings. Install in accordance with the manufactures instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
9. Only use attachments/accessories specified by the manufacturer.
10. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
For US and CANADA only:
Do not defeat the safety purpose of the grounding-type plug. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. When the provided plug does not fit into your outlet, consult an electrican for replacement of the absolete outlet.
IMPORTANT SERVICE INSTRUCTIONS
CAUTION: These servicing instructions are for use by qualified personnel only. To reduce the
risk of electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qualified to do so. Refer all servicing to qualified service personnel.
1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed when servicing the appliance.
2. Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be operated and is connected to the mains
3. Switch off the power before retrofitting any extensions, changing the mains voltage or the output voltage.
4. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal enclosure), respectively between the mains poles has to be 3 mm and needs to be minded at all times. The minimum distance between parts carrying mains voltage and any switches or breakers that are not connected to the mains (secondary parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissible when using original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictly obeyed. This applies also to any regulations about the work place itself.
8. All instructions concerning the handling of MOS - circuits have to be observed.
Note:
SAFETY COMPONENT (HAS TO BE REPLACED WITH ORIGINAL PART ONLY)
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CONTENTS
TABLE OF CONTENTS PAGE
SAFETY AND SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.1 DSP 244 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.2 Unpacking and warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2. CONTROLS AND CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
3. INSTALLATION AND CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Balanced input / output configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Unbalanced input / output configuration. . . . . . . . . . . . . . . . . . . . . . . . . 3-1
4. FIRST OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 Switching the power on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Level settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
5. QUICK START. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
6. CONFIGURATIONS OF THE DSP 244. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 Stereo 2 Way. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.2 Stereo 2 Way / Mono Sub + Fullrange . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3 3 Way + Fullrange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.4 3 Way / Mono Sub + Fullrange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.5 3 Way / Independent Sub + Fullrange. . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.6 4 Way . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.7 2-IN-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
7. OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1 Program Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.2 Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
7.3 Store Programs and Program Names. . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
7.4 Modifying Factory-Preset-Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
8. PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.1 Parameter Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.1.1 Parameter Access-Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.1.2 Parameter Link-Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
8.2 Description of Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
9. OPTION-FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1 Setting the LCD-Contrast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.2 Edit Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.3 Compressor and Limiter Threshold Unit. . . . . . . . . . . . . . . . . . . . . . . . 9-2
9.4 VU Level Meter Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
9.5 Edit Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
9.6 Temperature Unit settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9.7 MIDI RX / TX Channel settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9.8 Send Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
9.9 RS-232 To MIDI data transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4
9.10 NRS 90246 Contact Closure Interface settings . . . . . . . . . . . . . . . . . . 9-5
9.11 NRS 90247 RS-485 Interface Settings. . . . . . . . . . . . . . . . . . . . . . . . . 9-6
9.11 Display of the Software Revision Number . . . . . . . . . . . . . . . . . . . . . . 9-6
10. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
10.1 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
10.2 MIDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
10.3 Retrofitting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
10.3.1 Installation manual for the input transformer (NRS 90244) . . . . 10-5
10.3.2 Installation manuals for interface cards . . . . . . . . . . . . . . . . . . . 10-6
10.4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
10.5 Flow diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8
10.6 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
10.7 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
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INTRODUCTION
1. INTRODUCTION
First of all, we would like to thank you for and congratulate you on buying the DYNACORD Digital Sound System Processor DSP 244. To ensure an optimum in the performance of the appliance and to prevent any damage resulting from erroneous or inadvertent handling or operation, please read this owner’s manual carefully, before operating the DSP 244.
1.1 DSP 244 FEATURES
Providing 48-bit filter algorithms, 24-bit AD/DA conversion and a dynamic range of 115 dB, the DSP 244 sets new standards for digital loudspeaker controllers and processors. The DSP 244 is an universal Digital Sound System Processor that provides 2 inputs and 4 outputs; plus internal summing of the inputs 1 and
2. Via matrix it is possible to assign the outputs to any input or to the sum of the inputs. It is further possible to establish the following configurations: Stereo or Dual 2-Way systems, 3-Way + Direct and 4-Way systems, each with Mono Sub-channel, but also full range systems. High and low-pass filters are provided for the frequency crossover functions in all operation modes. The selection includes Linkwitz-Riley, Butterworth and Bessel type filters with switchable slopes between 6, 12, 18 and 24 dB/oct. A huge number of additional filters offers extremely flexible correction of the frequency response. Each input incorporates a 5-band equalizer, allowing to assign high and low-pass, high and low-shelving or parametric peak-dip filters to its individual filter sections. Next to the frequency crossover filters, four additional filters are employed in each output channel, which also can be set to work as high or low-pass, high or low-shelving filters, parametric peak-dip filters, or all-pass filters. Additional filtering is provided through 2. order high-passes for the realization of B-6 alignment, or special LPN-filters (Low-Pass Notch filters) for correcting the frequency and phase responses of optimally vented woofer cabinets. Each channel additionally provides a delay, a polarity switch, a programmable level control and a digital compressor / limiter while the master delays are located in the input channels. The user can choose between two operation modes: the “No Edit Mode” allows to simply select the required combination of loudspeaker systems from the factory preset program list. Afterwards, the appliance is optimally matched to the sound system and can be operated instantly. The “Full Edit Mode” on the other hand offers access to all parameters, allowing to freely program and store basically any setting. A total number of 80 memory addresses - 50 preset and 30 freely assignable user-programs - are available. Within the DSP 244, AD/DA conversion is taken care of by linear 24-bit converters; where the AD-section employs 128 times oversampling, gain-ranging Sigma-Delta converters. The DA-section offers 128 times oversampling Sigma-Delta converters. The overall signal processing is performed by two 24-bit Motorola signal processors.
Additional features are:
- FLASH memory for software and preset updates via serial interfaces
- PC-based operation and configuration software running under Windows ‘95 / Windows ‘98
- Standard MIDI-interface and RS-232 interface
- RS-485 interface or switching contacts optionally available
- Back-lit graphic-display with 122 x 32 dots
- Inputs and outputs are electronically balanced, XLR-type connectors
- Input transformer-balancing is optionally available
- Input / Output level controls, Output-Mute switch, channel function indicators SUB, LO, MID, HI
- Input / Output meter instruments, compressor and clipping LEDs Within this owner’s manual many of the DSP 244’s extensive features are explained in detail. Keep the
manual stored at a safe place to have it at hand for any further reference.
1.2 UNPACKING AND WARRANTY
Carefully open the packaging and take out the DSP 244. Remove the protective foil from the plexiglas of the LC-display. Next to this owner’s manual, the appliance is shipped together with mains cord and warranty card. Please make sure that the warranty card has been completed. Only with a fully completed warranty certificate any possible warranty claims can be granted. The appliance comes with a 36 months warranty which is valid starting with the original date of purchase; respectively when receiving the device from your dealer. Please keep the warranty certificate, the original invoice and also the original packaging at a safe place for any eventual shipping.
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CONTROLS AND CONNECTIONS
2. CONTROLS AND CONNECTIONS
2.1 FRONT PANEL 1, Control INPUT 1 / INPUT 2
Rotary controls to set the input levels of the inputs 1 and 2 of the DSP 244. The input signal can be amplified by up to 6 dB (control set to its clockwise margin) or attenuated by any degree. Set the level as high as possible without clipping to achieve the highest possible S/N ratio. Checking your settings is possible via the reading of the two level meter instruments.
2, Level meters The level meter instruments are meant for optical monitoring of the input signal levels, individually showing the peak value of the correspondent input signal. The input control should be set to a position so that the meter instruments indicate a level between -6 and -12 dB. To prevent internal clipping, make sure that the clip-LEDs are not lit. Two different indication modes can be selected: “Peak Hold”-function or “Slow Mode”.
3, Graphic display In the PLAY mode this 122 x 32 dots LC-display shows the name of the program, its number, name and description of the chosen loudspeaker systems, as well as the momentary active configuration. In EDIT mode the display shows the function blocks including their individual parameters and parameter values. Additionally and depending on the actually chosen mode, the display also indicates option menus, status messages, short operational notes, etc.
4, EDIT-key
This key allows to enter the EDIT mode. After pressing the button, the first or the last modified parameter of the active program is displayed. Other parameters are selected through the use of the SELECT-keys. The individual value of the momentary displayed parameter can be altered by means of the rotary encoder. For further information, please refer to chapter 7.2, “EDITING”.
5, SELECT-key <
While in EDIT mode, pressing the key selects the corresponding previous parameter. In the Option mode, it is used to select the corresponding previous “Option Page” and in the Store mode, pressing this key switches between program number and name editing.
6, SELECT-key > While in EDIT mode, the key is used to select the corresponding next parameter. In the Option mode, it serves to select the corresponding next “Option Page” and in the Store mode, pressing this key switches between program number and name editing.
7, OPTION-key The OPTION-key is used to enter the OPTION menu, allowing the user to alter and check appliance-re­lated settings. For further details, please refer to chapter 9, “OPTION FUNCTIONS”.
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CONTROLS AND CONNECTIONS
8, STORE-key This key allows the user to store edited programs in one of the user-definable program presets (U01 ­U30) or to copy programs from one preset to another. For further information, please refer to chapter 7.4, “STORE PROGRAMS AND PROGRAM NAMES”.
9, RECALL-key
Pressing this key lets you enter the PROGRAM SELECTION mode where you can select factory or user-definable program presets through using the rotary encoder. By pressing the RECALL-key, the selected program is acknowledged and gets loaded. For further information, please refer to chapter 7.1, ”PROGRAM SELECTION”.
10, Rotary encoder with push-button function
While in PROGRAM SELECTION mode, rotating the encoder selects the desired program. It is activated by pressing the RECALL-key. In EDIT mode, the encoder lets you alter parameter setting or leaf through function blocks. Simultaneously dialing the encoder while keeping it pressed increases the speed in which the parameter values are changed. For further details, please refer to the chapter “OPERATION” starting on page 7-1.
11, OUTPUT-controls 1 - 4
These rotary controls are used to set the output levels of channels 1 to 4, allowing to match the DSP 244 to the input levels of the devices chained in sequence. Correctly setting these controls results in an improved S/N ratio. In most cases, good results are achieved when setting the controls to their center position (-6). The digital output gain control should be used when higher output levels are needed. Use the rotary controls OUTPUT 1 - 4 to attenuate the output levels. It is not recommended to use the digital output gain control for massive attenuation, since this would decline the dynamic range of the D/A-con­verters. The rotary controls also provide push-button-functionality, which, in the EDIT mode is used to switch between function blocks, channel-related; i. e.: pressing a rotary control switches to the corresponding output channel. For further details, please refer to chapter 7.2, “EDITING”.
12, MUTE-keys 1 - 4
These keys allow to mute the output signal of the corresponding output channels. Pressing a key once switches the mute-function ON; the key’s red LED lights. Pressing the button again switches the mute-function OFF; the key’s LED is dimmed again.
13, Channel function indicators SUB, LO, MID, HI
These LEDs indicate, which frequency band the corresponding channel is set to. If a channel is configured for full range operation, all its function-LEDs are simultaneously lit.
14, Level meter indicators OUTPUT 1 - 4
These LEDs indicate the peak level of the corresponding outputs. The DSP 244 should be operated in a range, so that the clip-LEDs are not lit. Otherwise, this could lead to internal clipping. The indicators can be set to “Peak-Hold” or “Slow-Mode”.
15, Compressor indicators OUTPUT 1 - 4
The COMP-LEDs light, when the compressor / limiter of the corresponding channel is activated; e. g.: when the audio signal level exceeded the previously set threshold and therefore the output level is compressed or limited.
16, POWER ON/OFF-switch
This switch turns the DSP 244’s mains power on or off.
2-2
CONTROLS AND CONNECTIONS
2.2 REAR PANEL 17, Mains connector
Connect the supplied mains cord to the mains connector. The DSP 244 is capable of handling mains voltages between 90 V AC to 250 V AC, so that switching the mains on the appliance is not necessary.
18, RS-232 Interface
This is the data communication interface between the DSP 244 and a PC. It allows unit configuration and editing by using the DSP 244 Editor software. At this position installation of optional interface boards is possible, also. Available are: a RS-485 interface and a card for the connection of switching contacts (switches, relays) for remote program selection. For further details about the cards and their installation, please refer to the chapters “OPTION FUNCTIONS”, starting on page 9-5 and “RETROFITTING INSTRUCTIONS”, starting on page 10-6.
19, MIDI IN / THRU / OUT connectors
These sockets allow to control several DSP 244 via a single master unit. Exchanging memory contents in both directions is possible as well. Via MIDI, data communication between the DSP 244 and a computer’s desktop is possible as well, providing that a standard MIDI-interface has been installed in your PC / Notebook.
20, OUT 1 - 4 connectors
These are the 4 balanced outputs of the DSP 244. The signals of these sockets supply different frequency bands, depending on the appliance’s configuration (2-WAY, 3-WAY, 4-WAY). Please make sure that your power amplifiers and/or loudspeaker systems are always connected to the correct output channel. The individual configuration of the output channels is displayed through the “channel status indicators” on the front panel. The pin-assignment of the inputs and outputs is explained in detail in chapter 3.
21, IN 1 / IN 2 connectors
These are the 2 balanced inputs of the DSP 244. Each input employs a Direct Out connector which allows to feed the unaltered input signal to another DSP 244 or to any other device that needs to be operated with the unaltered source signal. In stereo or dual mode as well as in the monaural sub woofer mode, both connectors (LEFT / RIGHT) have to be connected accordingly. For all other operation modes using only the IN 1 (MONO) connector is sufficient. The pin-assignment of the inputs and outputs is explained in detail in chapter 3. Connection-examples for different configurations are provided in chapter 6.
2-3
INSTALLATION AND CONNECTIONS
3. INSTALLATION AND CONNECTIONS
Correct connections is a vital factor in achieving the best results with the DSP 244. Before switching on the power you have to connect the supplied European standard mains cord to the DSP 244 and your mains wall outlet. The power supply unit of the DSP 244 automatically adapts to supply voltages in a range of 90 to 250 VAC, so that the appliance can be operated with different, country-specific mains voltages. To prevent any trouble occurring from high temperatures inside the appliance, it is advisable not to use the DSP 244 in environments with ambient temperatures exceeding 40°C; sufficient air-flow is also always important. One HU is necessary for rack-installation. Normally, in this case, there are no special measures for ventilation necessary. Like with any other LF-signal processing unit, it is not recommended to install or operate the DSP 244 directly above or below any device that generates a massive magnetic field; e. g. power amplifiers. In this way the risk of unwanted interference is reduced to a minimum.
Before switching the DSP 244’s power on, make sure that all necessary connections have been established. So, make the required input and output connections in advance and in accordance to the desired configuration.
IMPORTANT:
Always use correctly shielded audio cables.
To prevent loosing treble frequencies, especially input cords should not exceed a length
of 10 m
3.1 Balanced INPUT/OUTPUT configuration
For best results, the DSP 244 is operated using its balanced inputs and outputs. In this configuration, the cable’s non-inverting conductor (+) needs to be assigned to pin 2 of the XLR-type connector while the inverting conductor (-) is assigned to the connector’s pin 3. The shielding has to be connected to pin 1. If the input channels supply transformers for galvanic isolation, the cable screen should not be connected to the ground plain of the transmitting device.
3.2 Unbalanced INPUT/OUTPUT configuration
It is also possible to operate the appliance in unbalanced input/output configuration. Therefore, the cable’s “HOT” conductor has to be connected to pin 2 and the screen to pin 1 of the XLR-type connector.
To prevent the level being attenuated by 6dB, you have to short-circuit pins 1 and 3 of the XLR-type connector. In case this measure leads to interference noise, removing this connection is recommended.
The following shows examples for balanced and unbalanced pin-assignments of audio cables, like they can be used with the DSP 244.
3-1
FIRST OPERATION
4. FIRST OPERATION
4.1 SWITCHING THE POWER ON
Using the POWER-switch (16) the DSP 244’s power is switched on. Upon initializing is complete, the last program that had been active before turning off the appliance is recalled. For now, the display shows:
Now, the DSP 244 is ready for operation. The display shows for instance:
Here, you have entered the factory preset program F01, which is an universal program for the 2-way operation. The configuration is stereo 2-way - the initial state of the DSP 244 when shipped from the factory. In case the appliance had been operated before, any other program might appear on the display.
For setting the DSP 244 in accordance to the configuration of your sound system, the best way to start is to select a factory preset program from the list that matches your actual system configuration (see chapter 7.1, PROGRAM SELECTION). You can copy this program to a user-definable preset and alter the settings according to your personal preferences (see chapter 7.4, STORE PROGRAMS AND PROGRAM NAMES, and chapter 7.2, EDITING).
4.2 LEVEL SETTINGS
To simultaneously achieve maximum headroom and minimal noise, the DSP 244 has to be properly integrated into the gain structure of the entire audio system.
You can set the desired input level of the DSP 244 using the two INPUT controls (1). Therefore, operate the system at the highest signal level that is to be expected in the further operation. Slowly turn the INPUT control (1) clockwise, while continuously monitoring the level meters (2) for peak readings. The optimal value for program peaks lies between -12dB and -6dB. The CLIP-LED’s indicate clipping of the AD-converter and should not light at all or at least only very briefly. When driving the DSP 244 below the mentioned range, its outstanding S/N ratio is not optimally used, resulting in probably audible system noise.
4-1
QUICK START
5. QUICK START
This paragraph describes in an overview the most important steps for a trouble-free operation of the DSP 244 in your PA-system. For a more detailed description of specific functions and parameters, please refer to the corresponding paragraph in the handbook.
MAINS CONNECTION
Plug in the supplied mains cord. Since the integrated power supply is capable of handling AC voltages between 90 V and 250 V, 50 / 60 Hz, within these limits no adjustments or switching is necessary.
AUDIO CONNECTIONS
Before integrating and operating the DSP 244 in your PA-system, you should determine which system configuration you are using. Chapter 6, CONFIGURATIONS OF THE DSP 244, provides you with a complete description of all possible configurations including their specific input and output assignments. Connect the appliance according to the chosen configuration. Do not feed in any audio signal yet.
POWER-ON OPERATION
After installing the DSP 244 in your PA-system setup and before operating it for the first time, please set the input controls INPUT1 / INPUT2 all the way counterclockwise, so that at this moment no audio signal is fed to the audio outputs. The appliance is factory-pre-set to the program F01 which is a universal preset for stereo 2-way operation. In case the appliance had previously been operated, it can start-up with any other program or configuration.
PROGRAM SELECTION
Together with the DSP 244 you receive a listing of all available factory presets. In case you are using a DYNACORD loudspeaker system that is listed, just select the corresponding program number and your PA-system is optimally configured.
If your loudspeaker system is not listed try a Generic preset together with a suitable configuration. Generic presets are available for all 7 configurations, offering preference settings that provide good results with any system setup.
For direct program selection press RECALL, select the desired program using the rotary encoder and to confirm your selection, press RECALL again (see also chapter 7.1, PROGRAM SELECTION).
LEVEL SETTING
Turn the input controls INPUT1 / INPUT2 clockwise, so that the level meters indicate values between
-12dB and -6dB; whilst there has to be only a little or no distortion at all. This guarantees best results for the S/N ratio.
CHANGING PARAMETERS
The DSP 244 is factory preset to the NO EDIT mode; e. g. parameter changes are not possible. You have to enter FULL EDIT mode to be able to edit parameters (see also chapter 9.2, OPERATION MODE SELECTION).
Editing factory pre-set programs is not possible. If you want to change the parameters of a factory pre-set program, you have to copy the program to a user definable preset in advance (U01 - U30) and save this preset under a different name (see chapter 7.4, MODIFYING FACTORY PRESET PROGRAMS).
Now you are able to change the parameter values in the EDIT menu; as described in chapter 7.2, EDITING.
5-1
QUICK START
X-OVER SETTINGS
In the Edit menu select the desired output channel by pressing the corresponding OUTPUT control. Then use the rotary encoder to select HIPASS XOVER in the display. Here you can set the low-cut frequency for the selected channel. Using the SELECT keys, you are able to select the parameters “Type” or “f” and edit their values through the use of the rotary encoder. After you are done, use the left SELECT key to re-position the cursor to the function block in the top line.
Using the rotary encoder you can now select LOPASS XOVER in the display. Here you are able to adjust the high-cut frequency for the selected channel. Proceed as described above for the low-cut setting.
Pressing another OUTPUT control selects the control’s corresponding channel and you are able to edit the parameter settings of this output channel. Again, proceed following the descriptions above.
Parameters are not linked in the Full Edit mode. Thus, you have to make sure that related low and high-cuts are set to the same values and filter characteristics.
LOUDSPEAKER EQUALIZATION
The DSP 244 embodies 4 EQs per channel for each output channel allowing to optimally match the frequency response for the connected loudspeaker components; similar to the factory preset programs. In case you want to program the EQs matching your own set of loudspeaker systems, you should know the exact frequency response of each component to be able to utilize the channel EQs efficiently.
In the EDIT menu, select the desired output channel by pressing the corresponding OUTPUT control. Then, by using the rotary encoder select CHANNEL EQ1 in the display. Here you are able to edit the first filter of this channel. Through use of the right SELECT key you are able to select the parameter “Type” and change its setting with the rotary encoder. Available for “Type” are:
PEQ (parametric Peak-Dip-Filter) LOSLV (Low Shelving Equalizer) HISLV (High Shelving Equalizer) LOPASS (Lo-Pass) HIPASS (Hi-Pass) ALLPASS (All-Pass for phase correlation correction)
All other parameters depend on the selected filter type. A complete overview is provided in chapter 8, PARAMETERS. The SELECT keys allow the selection of any parameter and the corresponding values are edited using the rotary encoder.
After you are done, use the left SELECT key to re-position the cursor to the function block in the top line. Using the rotary encoder you can now select next EQ sections to adjust its frequency response according
to your liking. Pressing another OUTPUT control selects the control’s corresponding output channel.
DELAY ALIGNMENT
Using the channel delays, it is possible to compensate construction-related delays of loudspeaker systems or delays that result from different positions of loudspeaker cabinets. Nevertheless, herefore, it is necessary to know the distance between cabinets as precise as possible.
Select the desired output channel in the Edit menu by pressing the corresponding OUTPUT control. Using the rotary encoder you can now select CHANNEL DELAY in the display. The parameters “Delay” or “Unit” are now accessible through the use of the SELECT keys and the rotary encoder can be used to alter their values. Afterwards, use the left SELECT key to re-position the cursor to the function block in the top line.
Pressing another OUTPUT control selects the control’s corresponding output channel.
5-2
QUICK START
COMPRESSOR / LIMITER SETTINGS
A compressor / limiter automatically reduces level peaks above a certain threshold and therefore provides reliable protection against power amplifier clipping and damaging the connected loudspeaker systems. In most cases it is absolutely sufficient to set the compressor’s threshold to the modulation limit of the connected power amplifier.
Select the desired output channel in the Edit menu by pressing the corresponding OUTPUT control. Using the rotary encoder you can now select COMPRESSOR in the display. Now, the SELECT keys can be used to select individual parameters. Their values are altered through the use of the rotary encoder. Afterwards, use the left SELECT key to re-position the cursor to the function block in the top line.
Using the rotary encoder you are now able to select LIMITER in the display. Proceed in the same way as described for the compressor to make the limiter’s parameter settings for the selected channel.
Pressing another OUTPUT control selects the control’s corresponding output channel.
MATCHING THE FREQUENCY RESPONSE
Using the Master EQs in the input channels of the DSP 244, the PA-system can be easily matched to various environmental and acoustical conditions. In many cases, a graphic equalizer which normally is employed to perform this task is not needed any longer.
In the Edit menu, use the rotary encoder to select MASTER EQ1 in the display. Here you can adjust the first filter of the selected input. Using the right SELECT key, you are able to select the parameter “Type” and alter its setting through the use of the rotary encoder. Available are:
PEQ (parametric Peak-Dip-Filter) LOSLV (Low Shelving Equalizer) HISLV (High Shelving Equalizer) LOPASS (Lo-Pass) HIPASS (Hi-Pass)
All other parameters depend on the selected filter type. A complete overview is provided in chapter 8, PARAMETERS. Using the SELECT keys, you are able to select all parameters and alter their values through the use of the rotary encoder.
Afterwards, use the left SELECT key to re-position the cursor to the function block in the top line. The rotary encoder can now be used to select another Master EQ to proceed with the shaping of the
frequency response. The rotary encoder also serves for selecting the second input channel.
5-3
CONFIGURATIONS OF THE DSP 244
6. CONFIGURATIONS OF THE DSP 244
The DSP 244 offers 7 pre-defined configurations. A configuration is a basic setting that includes the routing of inputs and outputs, the function of the outputs (Sub, Lo, Mid, Hi, Fullrange), as well as the kind and amount of parameters. These 7 configurations are:
- Stereo 2 Way
- Stereo 2 Way / Mono Sub + Fullrange
- 3 Way + Fullrange
- 3 Way / Mono Sub + Fullrange
- 3 Way / Independent Sub + Fullrange
- 4 Way
- 2-In-4
If you do not want to use one of the pre-defined configurations, you have also the possibility to operate the DSP 244 in Full Edit mode. This mode offers access to all parameters and basically any input/output routing can be programmed. Additionally, the output assignment (output function - Sub, Lo, Mid, Hi, Fullrange) is also freely definable. For further information, please refer to the chapters 8, PARAMETERS, and 9, OPTION FUNCTIONS.
- Full Edit
The active configuration is defined by the selected program; i. e.: each program is based on a specific configuration which is also displayed next to the program number and program name.
In general, all configurations offer identical signal processing blocks. Five filters are available for either one of the two input signals. These filters can be selected individually and used as parametric EQ’s, Low­/ High-Shelving filters or Lo-Pass- / Hi-Pass filters. It is further possible to individually assign the delay’s total delay time of 5.4 seconds to both input channels, to the sum of the two channels, and/or to the 4 outputs. Each output employs two X-Over filters (Hi-Pass / Lo-Pass). Linkwitz-Riley, Butterworth or Bessel filters (6, 12, 18, 24 dB/oct. slope) can be selected. Each output channel provides 4 additional filters which can be used as parametric EQs, Low- / High-shelving filters, or Lo-Pass and Hi-Pass filters, but also as All-Pass filters. In addition to a gain control for adjusting the output level and a polarity switch, each output is monitored by a digital compressor / limiter with adjustable threshold, attack and release.
In the following chapters you will find a more detailed description of the different configurations.
6-1
CONFIGURATIONS OF THE DSP 244
6.1 Stereo 2 Way
This configuration generally represents a 2-way stereo frequency crossover, where IN 1 serves as the left input channel and IN 2 as the right input channel. OUT 1 is the left Low-range output and OUT 2 is the left High-range output. OUT 3 and OUT 4 are the corresponding right Low-range and High-range output channels. The parameters of the inputs 1 and 2 as well as the ones of the Low-range and High-range outputs are always set to identical values; i. e.: the left and right channels are linked. The following figures illustrate the input / output routing of a typical STEREO 2-WAY installation.
6.2 Stereo 2 Way / Mono Sub + Fullrange
This configuration represents a 2-way frequency crossover with monaural sub-channel and additional Fullrange output. OUT 1 is the sub-channel that is fed by the summed audio signals of the inputs IN 1 and IN 2. OUT 2 and OUT 3 are the left and right High-range output channels. OUT 4 is a Fullrange output that is also fed by the summed signal of the inputs IN 1 and IN 2. For example, this output signal can be used to provide sound reinforcement in adjacent rooms. The parameters of the inputs 1 and 2 as well as the ones of the two High-range outputs are always set to identical values; i. e.: the left and right channels are linked. The following signal flow diagram is meant to illustrate the input / output routing scheme. The figure on the right bottom shows a typical configuration with monaural sub woofer and additional Fullrange installation.
6-2
CONFIGURATIONS OF THE DSP 244
6.3 3 Way + Fullrange
The 3-Way + Fullrange configuration is a 3-way monaural x-over with additional full range output where IN 1 serves as input channel. OUT 1 is the Sub-range channel, OUT 2 the Mid-range channel, OUT 3 the High-range channel, and OUT 4 is the Fullrange channel. OUT 4 can be used for example for monitoring, delayed full range-systems or to provide separate sound reinforcement in adjacent rooms. The internal structure of the 3-Way + Fullrange configuration is shown in the following signal flow diagram. An example of a typical 3-Way + Fullrange configuration is shown in the figure on the right bottom. Two DSP 244s are necessary for stereo operation.
6.4 3 Way / Mono Sub + Fullrange
This configuration also represents a 3-way frequency crossover with additional full range output, with the difference that the Sub-range channel OUT 1 is fed by the summed mono signal of the inputs IN 1 and IN 2. The outputs OUT 2 ... OUT 4 get their signal-feed from the input channel IN 1. OUT 2 is the Mid-range channel, OUT 3 the High-range channel, and OUT 4 the Fullrange channel. OUT 4 can be used for instance for monitoring, delayed full range-systems or to provide separate sound reinforcement in adjacent rooms. The internal structure of the 3-Way / Mono Sub + Fullrange configuration is shown in the following signal flow diagram. An example of a typical system configuration for this structure is shown next to the diagram. Two DSP 244s are necessary for stereo operation.
6-3
CONFIGURATIONS OF THE DSP 244
6.5 3 Way / Independent Sub + Fullrange
As well as the two previous configurations, this configuration also represents a 3-way frequency crossover with additional full range output, with the difference that the Sub-range channel OUT 1 gets its signal-feed from the input channel IN 2. Thus, it is independent from the other output channels. The audio signal for the outputs OUT 2 ... OUT 4 is fed from the input channel IN 1. OUT 2 is the Mid-range channel, OUT 3 the High-range channel, and OUT 4 the Fullrange channel. OUT 4 can be used for instance for monitoring, delayed full range-systems or to provide separate sound reinforcement in adjacent rooms. The internal structure of the 3-Way / Independent Sub + Fullrange configuration is shown in the following signal flow diagram. An example of a typical system configuration for this structure is shown next to the diagram. Two DSP 244s are necessary for stereo operation.
6.6 4 Way
The 4-Way configuration is a monaural 4-way frequency x-over. All outputs are fed by the input channel IN 1. OUT 1 is the Sub-range channel, OUT 2 the Low-range channel, OUT 3 the Mid-range channel, and OUT 4 the High-range channel. The internal structure of the 4-Way configuration is shown in the following signal flow diagram. An example of a typical system configuration for this structure is shown in the figure on the right bottom. Two DSP 244s are necessary for stereo operation.
6-4
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